I just installed a bcm kmra15 on my saint i know I torqued barrel nut to spec, and the handguard is rock solid however the barrel moves a little if i push on it by the flash hider. Is this normal?
"I torqued barrel nut to spec,"
what does that even mean.I have built 2-300 ar15s and Ive never went
by spec on anything because every upper and every lower acts different.
I slip bbl in and tighten the bbl nut till super tight and slip a nail in to make
sure clearance for gas tube,then I back it off and do that 2-3 times till it
is tight.I do use a little greese to get it past tight mark on first turn.
If you don't know what his statement means, I hope you are the only one shooting the 2-300 ar15s you have built.
If you don't know what his statement means, I hope you are the only one shooting the 2-300 ar15s you have built.
I have never had 1 issue on any of them.At least not any that were due
to my work.And no,They were for other people.Worked for a gun shop for
years in my off time.
I think its just a matter of wanting perfection and being mechanically inclined.
And not just with a Phillips screwdriver.I worked in a metal shop and other
related shops before,so that did help to recognize problems that could occur.
I do know what spec means,I just don't think it is spec anything on an ar15 or
they would have put specs in the instruction book and cd that they sell all
the time to assembly and disassembly an ar15.
A firearm is not something to have any doubts on.If you have 1% doubt you
can not do it. DON'T !!!
This processSo you did know what he meant but you wanted to paint yourself as a professional and attempt to belittle someone who came here looking for assistance because he asked a question in a manner you didn't like. Got it.
Torquing a barrel nut to spec:
1. Tighten the barrel nut to 30 foot-pounds.
2. Loosen it a little bit.
3. Tighten the barrel nut to 30 foot-pounds.
4. Loosen it a little bit.
5. Tighten the barrel nut to 30 foot-pounds.
6. Loosen it a little bit.
7. Tighten the barrel nut past 30 foot-pounds to the first spot where the gas tube can be installed. It is now timed and torqued correctly.
I just installed a bcm kmra15 on my saint i know I torqued barrel nut to spec, and the handguard is rock solid however the barrel moves a little if i push on it by the flash hider. Is this normal?
I just installed a bcm kmra15 on my saint i know I torqued barrel nut to spec, and the handguard is rock solid however the barrel moves a little if i push on it by the flash hider. Is this normal?
So you did know what he meant but you wanted to paint yourself as a professional and attempt to belittle someone who came here looking for assistance because he asked a question in a manner you didn't like. Got it.
Torquing a barrel nut to spec:
1. Tighten the barrel nut to 30 foot-pounds.
2. Loosen it a little bit.
3. Tighten the barrel nut to 30 foot-pounds.
4. Loosen it a little bit.
5. Tighten the barrel nut to 30 foot-pounds.
6. Loosen it a little bit.
7. Tighten the barrel nut past 30 foot-pounds to the first spot where the gas tube can be installed. It is now timed and torqued correctly.
Dave Porter is correct. The new barrel that came with the KMR is proprietary to that handguard the new proprietary nut is slightly out of spec to the existing barrel extension on your barrel. even though the nut is tight there is a space between the shoulder on the extension and the front wall of the barrel nut. This is easily remedied with the use of barrel nut shims that you can purchase in a set. (thin washers of various thicknesses that will take up that space) https://www.ebay.com/itm/5-56-Free-...821524?hash=item4d558d8bd4:g:7C8AAOSwV0RXtkIL